30 • Alarm Indications Beacon 410 Gas Monitor Operator’s Manual
3. After the gas reading falls below the alarm 2 setpoint, press and release the reset
switch to reset the alarm circuit. Resetting the alarm circuit silences the buzzer (if the
alarm has not been acknowledged) turns off the alarm 2 LED, resets the display for
the channel(s) in alarm, turns off the strobe if it is installed and set to activate for alarm
2 only or if a channel is an oxygen channel, and de-energizes the common and
channel alarm 2 relays. For oxygen channels, the reset switch also de-energizes
relay D.
Alarm 3 Condition
This section describes the indications for an alarm 3 condition and suggests responses to
an alarm 3 condition.
NOTE: The factory set configuration of the Beacon 410 does not assign channel relay
contacts to the alarm 3 condition. Relays A, B, C, and D are factory set as
common alarm relays, but can be configured as channel alarm 3 relays. See
“Viewing and Changing Global Parameters” on page 33 and “Viewing and
Changing Channel Parameters” on page 36 for instructions to change relays A,
B, C, and D from their factory setting.
Alarm 3 condition indications
When the gas reading of an active channel reaches the alarm 3 setpoint, the Beacon 410
senses an alarm 3 condition. The Beacon 410 alerts you to an alarm 3 condition as
follows:
• the alarm 3 LED turns on;
• the gas reading during an alarm 3 condition continues to flash and alternates with the
ALM 1,2,3 (ALM 1,3 for oxygen) message;
• the buzzer sounds a pulsing tone;
• the common alarm 3 relay (relay C) energizes
• if installed and set to activate for alarm 1 and/or alarm 2 for non-oxygen channels or
alarm 1 for oxygen channels, the strobe continues to flash
• if set to activate for alarm 3 only, it begins to flash when an alarm 3 condition begins
Responding to an alarm 3 condition
This section suggests responses to an alarm 2 condition.
1. Follow your established procedure for a high-level combustible or toxic gas condition,
or an increasing oxygen condition.
2. To acknowledge the alarm condition and silence the buzzer while in an alarm 3
condition, press and release the reset switch. The ALARM 3 LED will begin to flash
indicating the alarm condition has been acknowledged. You cannot de-energize the
common alarm 3 relay (relay C) until the gas reading falls below the alarm 3 setpoint.
3. After the gas reading falls below the alarm 3 setpoint, press and release the reset
switch to reset the alarm circuit. Resetting the alarm circuit silences the buzzer (if the
alarm has not been acknowledged) turns off the ALARM 3 LED, and de-energizes the
common alarm 3 relay.
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